UV and vacuum treatment, as well as annealing, were tried to recover the gas sensing property of WO3 films. Results
show that gas sensing films can partially recover one or two coloring and bleaching cycles if kept in vacuum condition.
And UV irradiation can well recover several cycles. But heat treatment does not show any obvious effect on the gas
sensing recovery. Furthermore, IR and XPS spectra were used to identify the mechanism of this improvement. Results
reveal that changes of water content will reduce the desorption energy of hydrogen atom, which will accelerate the
bleaching velocity.
In this paper, WO3 sol was prepared via the sol-gel method, and palladium chloride powder was dissolved in the sol in
different W: Pd molar ratios. Pd doped WO3 films were coated on silicon wafers and ordinary slide glasses by
dip-coating method. The grain distribution of WO3 sol doped with PdCl2 was measured by Laser Particle Size Analyzer.
Surface morphology and microstructure of WO3 films which doped or undoped with PdCl2 were analyzed by AFM,
which show that PdCl2 has an important effect on the structure of the WO3 films. The gasochromic properties of the films
are investigated by UV-Vis spectrophotometer. The WO3 films show good gasochromic properties. The effect of
concentration of PdCl2 on gasochromic kinetic process of WO3 films was investigated. Finally the modulation of the
light transmittance by the gasochromic films was discussed.
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